Quote:

...So the 15-20 psi pressure, that would actually be 29.69 to 34.69 psia (add 14.69 to the pressure). So that will give a boiling point (saturation temp) of anywhere from ~250 - 258 deg F).





But would you add the atmospheric pressure to the pressure of a CLOSED/fluid filled system, with virtually no atmosphere (air) with-in that closed system, such as your automotive cooling system, since it's isolated from the outside atmospheric pressure, and ONLY pressurized by the limit of the radiator cap (or the weakest link).

In other words, your cooling system isn't holding a max. pressure of 30 psi (15 atmos. + 15 by system design), which would make the boil over temp. about 250F, or would it?


And you may see me tonight With an illegal smile J. Prine